ethyl 3-((2R,3S)-3-((4R,5R)-2,2-dimethyl-5-((2,2,2-trifluoroacetamido)methyl)-1,3-dioxolan-4-yl)oxiran-2-yl)acrylate

{(4R,5S)-5-[(R)-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-hydroxy-methyl]-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl}-carbamic acid benzyl ester

(E)-3-{(2R,3S)-3-[(4R,5R)-5-(Benzyloxycarbonylamino-methyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-oxiranyl}-acrylic acid ethyl ester

3-{(2R,3S)-3-[(4R,5R)-5-(Benzyloxycarbonylamino-methyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-oxiranyl}-propionic acid ethyl ester